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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3cd9aa00a51d1a60259e7c281ba50044d041293c6888bb7103bc919c4c29040' 
  AND token = 'yriLE1nQ2yhc6zTAlq70KnLWaoNk2MJ4CycQ052CDHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}